Fentanyl patch

Opioids and strong painkillers

Also known as Duragesic

The fentanyl patch delivers a very strong opioid through your skin, slowly and steadily, for constant severe pain that other opioids can't control. It's only for people whose bodies are already used to opioids — it must never be someone's first opioid, because the dose would overwhelm them. It takes many hours to build up when you put a patch on, and many hours to fade after you take one off, so changes happen slowly in both directions.

How to take it

When

Change it on schedule — usually every 72 hours — exactly as prescribed, placing the new patch on a different spot of clean, dry, hairless skin. It takes hours to reach full effect and keeps working for hours after removal. Don't stop suddenly after regular use — your doctor will taper you down.

Heat, not food

Food doesn't affect the patch — but heat does, dangerously. Fevers, heating pads, electric blankets, hot tubs, saunas, and long hot baths make your skin absorb the medicine faster, which can cause an overdose. Tell your doctor right away if you get a fever.

Avoid

Never mix with alcohol, benzodiazepines (like Xanax or Klonopin), sleep medicines, or other sedatives — that combination can stop your breathing. Never cut or damage a patch — a torn patch can release a fatal amount. Don't drive until you know how it affects you. If you're pregnant, tell your doctor — a baby can be born in withdrawal.

Used patches

A used patch still holds enough fentanyl to kill a child or a pet. The moment you remove one, fold it sticky-side together and dispose of it safely — the FDA says to flush it or use a pharmacy take-back. Lock unused patches away, never share them (it's illegal and dangerous), and keep naloxone (Narcan) at home — the FDA recommends it for everyone on opioids.

Missed a dose?

If you forget to change your patch on schedule, remove the old one and put on a new patch as soon as you remember, then return to your regular schedule. Never wear two patches at once unless your doctor specifically prescribed it — never double up.

Common side effects

Constipation — nearly everyone on opioids gets it, so stay ahead of it with fluids, fiber, and a stool softener if your doctor agrees
Drowsiness or mental fog
Nausea, especially when starting or after a dose change
Redness or mild itching where the patch sits
Dizziness or lightheadedness

Call a doctor if

Very slow, shallow, or stopped breathing, gurgling or snoring sounds, blue lips or fingertips, or someone who can't be woken — this is an overdose. Give naloxone if you have it and call 911 immediately, and remove the patch
A child or pet has touched, chewed, or worn a patch — even a used one — call 911 right away; this is a life-threatening emergency
A fever, or feeling suddenly much drowsier than usual — heat can speed absorption into overdose territory; call your doctor immediately
A patch that has come loose and stuck to someone else's skin — take it off them, wash the area with water only, and get medical help
Hives or swelling of your face, lips, or throat — call 911 if breathing is affected

Educational only. This summary is drawn from public FDA labeling and MedlinePlus and simplified for readability. Your prescription label and your pharmacist always come first — doses and instructions vary from person to person.